There's now a microATX motherboard and workstation for native RISC-V development based on the SOPHON SG2042 64-core RISC-V C920 processor with up to 128GB
$1199 for the board with chip+heatsink, or $1999 for a complete assembled system. Delivery by Christmas 2023.
I don't know, it's great to see the form factor, but I don't think twice the price of the HiFive Unmatched for 64 T-Head C920 cores (about RaspBi 3B+ level with RVV 0.71 draft extension) glued together is worth it.
I'll keep watching for Horse Creek and whatever Ventana Micro Systems are doing.